Perhaps you should try some spelling variations:
insurance network » insurance networks, assurance network, assurance networks
systems support » system support, systems supporting, system supporting
dence network » dense network, defence network, dense networks
health dence » health device, health evidence, health science

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( health dence network synthesis report ) OR ( health insurance network systems support )).
• Adding a wildcard symbol may retrieve word variants: (( health dence network synthesis report ) or ( health insurance network systems support ))*.